Australia, Canada, and Italy were named by the U.S. government at the end of 2004 as being the most likely partners in the development of the P-8A Multimission Maritime Aircraft (MMA), based on a Boeing 737 airframe. The US Navy is now in formal talks with these potential international partners, and India has also expressed interest. The U.S. market alone is estimated to be $20 billion, and the P-8 replaces the P-3 Orion aircraft currently in service with 15 countries.